Fixed based on reviewer's comment. 1. DB schema change    vcpu/memory/hdd info were stored into Service table.    but reviewer pointed out to me creating new table is better    since Service table has too much columns.
Fixed based on reviewer's comment.
1. DB schema change
   vcpu/memory/hdd info were stored into Service table.
   but reviewer pointed out to me creating new table is better
   since Service table has too much columns.

2. Querying service table method
   Querying the compute-node recode from DB, several method were
   used to same purpose. Changed to use same method.

3. Removing unnecessary operation.
   FixedIP no longer have host column.
   I didnt find that, remove unnecessary operation from post_live_migration..

4. Test code 
   Modified testcode to fit following the above changes.

openstack/oslo.versionedobjects,citrix-openstack-build/oslo.versionedobjects